ELEC 01

1. The following are examples for good conductors:1- Ferrometal2- Aluminium3- Wood4- Copper5- Silver6- Dry air7- Plastic8- Gold A) 1 2 4 5 8 B) 2 3 4 5 C) 4 5 6 7 8 D) 1 2

2. Which of the following statements about static discharge wicks is/are correct:1- Static discharge wicks must be good insulators.2- Static discharge wicks are flexible to withstand fatigue caused by turbulence.3- Static discharge wicks are most commonly placed near the wing roots.4- Static discharge wicks must be inspected before flight to check that they are present and relatively undamaged.5- No static discharge wicks may be missing before flight. A) 2 4 B) 1 2 C) 3 4 D) 1 5

3. Good conductors have many __________ electrons. A) free B) tightly bound

4. An accumulation of electric charge on an object is known as: __________ electricity. A) static B) dynamic C) electrical

5. An accumulation of charge on an object is more likely when the object is surrounded by __________. A) a poor conductor B) a good conductor C) water

6. Static electricity is most likely to accumulate on an airframe when the aircraft is flying through very __________ air. A) dry B) moist C) damp D) humid

7. Small, dry ice crystals suspended in the air are __________ to result in accumulated charge on an airframe. A) more likely B) less likely C) never

8. The components which ease the flow of accumulated electrical charge from airframe to atmosphere are called __________ __________ discharge wicks. A) static B) electrical

9. To ensure that there is no electrical potential difference between one part of the airframe and another, all parts must be __________ together. A) bonded B) grounded C) charged

10. Poor electrical __________ may cause electrical components to fail or static interference on the radios. A) bonding B) grounding C) isolation

11. The possibility of a large electrical potential difference between the aircraft and the earth means that the aircraft absolutely must be __________ before the refuelling nozzle is withdrawn from its holder. A) grounded B) bonded

12. A well-bonded airframe can be used as a common __________ __________ for electrical circuits. A) earth return B) electrical circuit C) negative return

13. Which of the following statements about Ohm's law is/are correct.1- Ohm's Law states that P = I V2- Ohm's Law states that V = I R3- Ohm's law states that I = V R4- Ohm's Law states that I = V / R A) 2 4 B) 2 3 C) 1 2 D) 1 4

14. A circuit contains 3 loads (consumers) wired in series. The resistances of the loads are: 4 Ohms, 10 Ohms and 400 Ohms.The total resistance of the 3 loads is: A) 414 Ohms B) 2.87 Ohms C) 4 Ohms D) 0.325 Ohms E) 400 Ohms

15. A circuit contains 3 loads (consumers) wired in parallel. The resistances of the loads are: 4 Ohms, 10 Ohms and 400 Ohms.The total resistance of the 3 loads is: A) 2.84 Ohms B) 414 Ohms C) 0.325 Ohms D) 4 Ohms E) 400 Ohms

16. The __________ is the unit of electrical potential difference. A) volt B) amp C) watt

17. The unit of current is the __________ . A) amp B) Joule C) volt

18. The unit of current describes the amount of __________ flowing per unit of time. A) charge B) voltage

19. An electrical potential difference generates an __________ force. A) electromotive B) electromagnetic

20. Current will flow through a __________ circuit when an emf is present. A) closed B) open

21. Current which flows in 1 direction only is known as __________ current. A) direct B) alternating C) static

22. Good insulators provide __________ resistance to current flow. A) strong B) weak

23. A voltage is induced across a material with a positive thermal coefficient of resistance. The current flowing through the material will __________ as the material gets hotter. A) decrease B) increase

24. The energy flowing through an electrical circuit per second is measured in __________. A) watts B) amps C) volts

25. A copper wire, with very good conducting properties, is used to connect the 2 terminals of a battery directly. The result is a __________ circuit which could produce a dangerous amount of heat. A similar condition occurring in an aircraft could result in an electrical fire. A) short B) electrical

26. The 2 typical nominal voltages for aircraft batteries which are off-load are:1- 12v2- 14v3- 24v4- 28v A) 1 3 B) 1 2 C) 2 3 D) 1 4

27. For lithium and NiCd batteries, thermal runaway can be triggered by:1- Excessive charge rate2- Mechanical damage3- Mechanical shock.4- Chemical shock.5- Excessively low atmospheric pressure.6- Excessively high ambient temperature.7- Short circuit. A) 1 2 3 6 7 B) 1 2 3 4 5 C) 1 3 4 6 7 D) 2 3 5 7

28. A lithium battery fire can only be extinguished by: A) Water or other non-flammable liquids. B) Halon C) BCF D) Carbon Dioxide

29. A substantial conductor powered by an electrical source such as a battery or generator which has multiple attachment points for loads (consumers)' is a description of: A) A busbar B) A battery. C) A contactor. D) A common earth return.

30. Your 40 Ah aircraft battery is fully charged and in peak condition when, during flight, your electrical generator fails. The centre-zero ammeter reads - 20 A. If you don't load-shed immediately, you can expect the battery to last for an absolute maximum of: A) 2 hrs B) 4 hrs C) 10 hrs D) 20 hrs

31. An aircraft battery provides a short-term, limited source of electrical energy. A __________ battery supplies less charge and a __________ maximum rate of discharge. A) cold; smaller B) cold; zero C) warm; smaller D) warm; zero

32. __________ batteries have a better power to weight ratio than __________ batteries. A) lithium; lead-acid B) lead-acid; lithium

33. The unit of measurement for battery capacity is the __________ hour. A) ampere B) voltage C) wattage

34. To charge an aircraft battery, the battery busbar voltage must be __________ than the nominal battery voltage. A) higher B) lower

35. __________ batteries, when discharging, sustain the correct voltage for a relatively long period before becoming exhausted. A) lithium and NiCd B) lead-acid

36. A battery comprises several __________ wired in __________. A) cells; series B) terminals; series C) busbars; series D) contactors; series E) cells; parallel F) terminals; parallel G) busbars; parallel H) contactors; parallel

37. When 'on-load' the voltage of a battery should be slightly __________ than the voltage measured across the terminals when the battery is 'off-load'. A) lower B) higher

38. A large drop in battery voltage when placed on-load indicates that the battery is __________. A) in poor condition B) in good condition C) a NiCd or lithium type D) open-circuited

39. Which of the following descriptions of switches are correct:1- A rocker switch usually has 2 or 3 positions. The position of the switch is determined by looking to see whether it has been 'rocked' to the top or bottom, or is centred.2- A toggle switch can usually be selected in one of several positions.3- A rotary switch usually has an arrow-shaped knob to show you which position it is selected to.4- All rotary switches have infinitely adjustable positions.5- A switchlight is a type of push button switch with a back-lit display.6- Switch lights usually can only be toggled between one state and another. A) 1 2 3 5 6 B) 1 2 3 4 C) 1 3 4 D) 1 5 6

40. Which of the following statements about guarded switches is/are correct?1- One purpose of guarding a switch is to avoid accidental operation of the switch.2- Push button switches are frequently gated. 3- 'Gating' is one method of guarding against accidental switch selections.4- A gated toggle switch must be depressed (pressed in) before it can be moved out of its gate.5- One purpose of guarding a switch is to ensure that very positive and deliberate actions must be taken to operate the switch. A) 1 3 5 B) 1 2 3 4 C) 1 2 3 D) 2 4

41. Which of the following statements about fuses and circuit breakers is/are correct?1- A 10a fuse fitted in a 5a circuit will provide an additional safety margin in the event of overcurrent.2- A circuit breaker may only be reset in-flight in accordance with procedures laid out in the FCOM.3- A white collar visible around a circuit breaker indicates that the breaker is in.4- There is usually no immediate visual indication of a blown fuse, unless you physically take it out and examine it.5- Popping and then resetting a circuit breaker can sometimes be used to reset a system or computer when part of an approved procedure. A) 2 4 5 B) 1 2 4 C) 2 3 4 D) 3 4 5

42. Protecting a circuit from damage caused by excessive current is a function of __________. A) fuses and circuit breakers B) circuit breakers only C) fuses only

43. The wire in a fuse is made from material with __________. A) a positive thermal coefficient B) a negative thermal coefficient

44. The advantage of an electromechanical circuit breaker over a thermally activated circuit breaker is that it can: __________. A) be made sensitive to current direction B) be reset multiple times

45. A bimetallic strip is a component used in __________. A) a thermally activated circuit breaker B) an electromechanical circuit breaker C) a fuse

46. The most serious threat posed by overcurrent in a circuit is __________. A) fire B) damage to the fuse C) damage to the circuit breaker D) damage to the electrical components

47. A __________ overcurrent condition in a circuit may be addressed by resetting the circuit breaker in accordance with the FCOM. A) transient B) permanent

48. The primary threat from multiple or unauthorised resets of a circuit breaker is __________. A) electrical fire B) damage to the generator C) damage to the battery

49. A __________ can be reset. A) popped circuit breaker B) blown fuse

50. Fuses and circuit beakers are 'rated' according to the maximum __________ they can sustain before blowing or popping respectively. A) current B) voltage C) wattage

51. A short-circuit condition __________ rectified by replacing the fuse or resetting the circuit breaker. A) cannot be B) can be

52. "Overcurrent results in excessive heating which causes the circuit protection device to open the circuit'. This is a description of: __________. A) a thermally activated CB or a fuse B) an electromechanical CB C) a fuse only

53. Which of the following statements about electromagnetism is/are correct?1- An electrical current flowing through a wire produces a magnetic field around the wire.2- A copper wire moving across a magnetic field will experience current flowing through it.3- The strength of the magnetic field created by current flowing though a wire is inversely proportional to the current flow.4- A ferrous metal core inserted inside a coil of wire will increase the strength of the magnetic field when current flows through the coil. A) 1 2 4 B) 1 2 C) 2 3 D) 3 4

54. A coil wrapped around a fixed ferrous core creates an electromagnetic force when the coil is energised. This closes a switch to allow high current to pass through a second circuit'. This is a description of a __________. A) relay B) solenoid C) battery

55. A ferrous metal core moves when a current is caused to flow in a coil of wire wrapped around it'. This is a description of a __________. A) solenoid B) relay C) battery

56. An aircraft wiring loom comprises bundles of wires. If the wires are not shielded, a current flowing through one wire will __________. A) cause current to flow in adjacent wires B) cause a build-up of static electricity C) cause a short-circuit

57. The phenomenon whereby a voltage and current is generated in a conductor when it is moved across a magnetic field is called electromagnetic __________. A) induction B) conduction

58. Which of the following statements about electrical power generators is/are correct?1- An AC waveform is created by rotating coils of conducting wire in a magnetic field.2- An AC waveform is created by rotating a magnetic field within which there are coils of conducting wire.3-DC current is created by rotating coils of conducting wire in a magnetic field.4- Rotating coils of conducting wire in a magnetic field causes current to flow first in one direction and then in the opposite direction, depending on the orientation of the coils.5- Frequency describes the number of cycles per second. A) 1 2 4 5 B) 1 2 3 4 C) 2 3 4 5 D) 1 3 4 5

59. An electrical generator driven by an engine creates electrical energy by the process of electromagnetic __________. A) induction B) generation C) conduction

60. The number of waves per second, measured from peak to peak, is the __________ of the waveform. A) frequency B) amplitude

61. The unit of frequency is the __________. A) hertz B) amp C) volt D) degree

62. The AC waveform is a __________ shape. A) sinusoidal B) eliptical C) flat

63. The position of a waveform is defined by its __________. A) phase or phase angle B) frequency C) displacement angle

64. The unit of power for AC is the __________. A) Watt B) volt amp C) Joule

65. kVA is the unit typically used to describe the power output of an aircraft's __________ generator. A) AC B) DC

66. Which of the following is used to adjust the current flow to the generator's electromagnet? A) A voltage control unit. B) A starter unit. C) An electric motor control unit. D) An APU.

67. Which of the following is fitted between the alternator/generator and the busbar to ensure that the battery cannot drive the alternator/generator. A) A reverse current protection device. B) A voltage protection device. C) A voltage control unit. D) A surge protector.

68. When the voltage of the alternator/generator reduces below the voltage at the busbar, then the current flow will reverse. If nothing is done to stop this, the alternator/generator becomes: A) An electric motor driven by the battery. B) An electric motor driven by the engine's RPM. C) A commutator. D) An alternator.

69. This unit operates as a starter motor during engine start and a DC generator after engine start. It is called a: A) A DC starter-generator. B) A DC alternator. C) A DC generator.

70. A DC __________ creates electrical current by rotating an electromagnetic field, inside which are coils of wire. A) alternator B) generator C) commutator

71. A DC __________ creates electrical current by rotating coils of wire inside an electromagnetic field. A) generator B) alternator C) commutator

72. A __________ is used in a DC __________ to cut off the flow of current whenever it becomes negative. A) commutator; generator B) rotor; alternator C) armature; commutator D) alternator; generator

73. Solid-state __________ are used in a DC alternator to cut off the flow of current whenever it reverses direction. A) diodes B) commutators

74. The most common modern type of DC generation device is an __________ . A) alternator B) generator C) commutator

75. DC alternators and generators produce a __________ emf the faster they rotate. A) greater B) smaller

76. The voltage of DC alternators and generators varies with __________ . A) engine RPM B) aircraft vertical speed C) engine torque

77. A voltage control unit of a DC generating device must output a constant __________ at all engine RPM. A) voltage B) current C) frequency

78. If the voltage of the alternator reduces below the voltage of the battery, then current flow will flow from the __________ to the battery busbar. A) battery B) Alternator

79. A component consuming 80 watts at 8 amps would require a supply of:

80. Which of the following statements is correct? 1. By increasing the load on an electric motor (i.e. increasing the resistance against rotation), the power output will increase as a result of an increased current flow. 2. The torque of an electrical motor can be calculated by dividing the power by the motor RPM.

81. Assuming the initiating cause is removed, which of these statements about resetting a protection device are correct or incorrect? 1. A fuse cannot be reset 2. A circuit breaker can be reset

82. Electrical bonding of an aircraft is used to: 1. Protect the aircraft against lightning effects. 2. Ensure an electrostatic potential of the aircraft of approximating 0 volt. 3. Reduce radio interference on radio communication systems. 4. Ensure the different aircraft parts are at the same electrical potential. The combination that regroups all of the correct statements is:

83. Regarding the capacity of a battery and its measurement, which statement(s) ls/are correct/incorrect? 1. The battery capacity is determined by multiplying a current flow in Amperes by the time in hours that the battery is being discharged. 2. The total battery capacity is dependent on the voltage rating of its battery cells.

84. The resistors R1 and R2 are connected in parallel. The value of the total resistance is given by the following formula:

85. When connecting two 12 volt 40 ampere-hour batteries in parallel, what will be their total voltage and capacity?

86. Static dischargers: 1. are used to set all the parts of the airframe to the same electrical potential. 2. are placed on wing and tall tips to facilitate electrical discharge. 3. are used to reset the electrostatic potential of the aircraft to a value approximating 0 volts. 4. are located on wing and tail tips to reduce interference with the on-board radio communication systems to a minimum. 5. limit the risks of transfer of electrical charges between the aircraft and the electrified clouds. The combination that regroups ail of the correct statements is:

87. The voltage of a fully charged lead-acid battery cell is approximately:

88. If a battery's ammeter shows +24 , what is happening?

89. The advantages of alternating current on board an aircraft are: 1. Simple connection. 2. High starting torque. 3. Flexibility in use. 4. Lighter weight of equipment. 5. Easy to convert into direct current. 6. Easy maintenance of machines. The combination of correct answers is:

90. The advantages of Nickel-Cadmium compared with Lead-acid batteries are: 1. Lower risk of thermal runaway. 2. Higher internal resistance, hence higher power. 3. Reduced charging time. 4. Constant output voltage. The combination of the correct statements is:

91. In order to produce an alternating voltage of 400 Hz, the number of pairs of poles required in an AC generator running at 6000 rpm is:

92. The most widely used AC frequency in aircraft is:

93. f a current is passed through a conductor which is positioned perpendicular to a magnetic field:

94. When a conductor cuts the field lines of a magnetic field:

95. A relay is:

96. When carrying out a battery condition check using the aircraft's voltmeter:

97. Electric motors on aircraft can be:

98. A current limiter fuse in a DC system is used to:

99. The capacity of a battery is the:

100. Batteries are rated in:

101. The rating of electrical fuses is expressed in:

102. The unit that converts DC into AC is:

103. The type of gate that requires all 'TRUE' inputs for a 'TRUE' output is:

104. One of the main functions of the battery in large transport aircraft is to:

105. To ensure correct load sharing between AC generators operating in parallel:

106. Given: Q = charge (Coulombs). U = potential difference between the plates (Volt). The capacitance C (Farads) is defined by the following formula:

107. A constant speed drive (CSD) that has been disconnected in flight:

108. A test to assess the state of charge of a Lead-acid battery would involve:

109. The very rapid magnetic field changes (flux changes) in the primary coil of a magneto are accomplished by the:

110. The input and output of a static inverter are respectively:

111. f the frequency of the supply in a series capacitive circuit is decreased, the current flowing in the circuit will:

112. An inverter is a:

113. The purpose of static wick dischargers is to:

114. The purpose of static wick dischargers is to:

115. When the AC generators are connected in parallel, the reactive loads are balanced by means of the:

116. The unit used to measure the capacitance of a capacitor is the:

117. The purpose of a voltage regulator is to control the output voltage of the:

118. The function of the generator breaker is to close when the voltage of the:

119. When the AC voltage across a capacitor is kept constant and the frequency is increased, the current through the capacitor will:

120. The essential difference between aircraft AC alternators and DC generators (dynamos) is that the:

121. A capacitor in parallel with breaker points:

122. The function of a NOT logic gate within a circuit is to:

123. When the battery ammeter shows "+24" the battery:

124. The phase relationship between two unparalleled AC generators:

125. If one of the 12 cells of a Lead-acid battery has a broken connection rendering it inoperable, the battery:

126. What is the unit of measurement for electrical work?

127. The power output of a normally aspirated piston engine increases with increasing altitude at constant Manifold Absolute Pressure (MAP) and RPM because of the:

128. An advantage of nickel-cadmium compared with lead-acid batteries is that they:

129. Frequency wild' in relation to an AC generation system means the generator:

130. When using a fuse with a higher rating than prescribed:

131. DC generators in multi engine aircraft are connected in:

132. ln flight, if the temperature of the constant speed drive (CSD) ls in the red arc the:

133. The electrolyte in a Nickel-Cadmium battery is:

134. A thermal circuit breaker:

135. An AC generator driven by a constant speed drive (CSD):

136. The moving part in an AC generator is usually referred to as the:

137. The purpose of static discharge wicks is to:

138. One indication of inadequate bonding of aircraft components may be:

139. Which of the following formulas describes how the torque of an electrical motor is determined by the supplied voltage and current and the resulting RPM. T = Torque, U = Voltage, H = RPM, I = Current.

140. A capacitor can be used as a:

141. A lithium polymer battery is most likely to be a hazard to the aircraft when:

142. Regarding ohm's law:

143. In the event of an AC generator fault, on a twin engine aircraft, the protection device will open:

144. It is NOT recommended to reset a tripped circuit breaker during flight because:

145. When a battery is almost fully discharged there is a tendency for:

146. In a DC (Direct Current) circuit, what will happen if the current gets too high and ls not detected?

147. In aeronautics, the most commonly used batteries are NiCd because:

148. Circuit breakers protecting circuits may be:

149. The commonly used symbol for voltage is:

150. AC generators operated in parallel must have the same:

151. If we connect two batteries in series what happens to the voltage and capacity?

152. Electrical potential is measured in:

153. ln reference to an inverter unit, which of these relationships between AC and DC is correct?